A neighbor of mine is looking at purchasing a 4425 with about 2500 hours on it. He asked me about the machine, what I knew, and it wasn't much. It looks to be a later model 4420 and 4400. Different cab ect. What is the story on these combines? I looked on tractor house and there wern't many for sale, not many produced? Were they as good as the earlier 44's? Foreign made? Any information or review would be helpful.